layout_activity_3.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:id="@+id/layout_acitivity_3"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context="com.developerrandom.belajarmenghubungkanmactivity.Activity_3">
 
    <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="INI ACTIVITY 3"
       android:layout_centerInParent="true"
       android:textSize="25sp"/>
 
</RelativeLayout>